/*
 *  Copyright 2008-2010 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */


/*! \file uninitialized_fill.h
 *  \brief Defines the interface to the dispatch
 *         layer of the uninitialized_fill function.
 */

#pragma once

#include <thrust/fill.h>
#include <thrust/for_each.h>
#include <thrust/detail/type_traits.h>

namespace thrust {

namespace detail {

namespace dispatch {

// trivial copy constructor path
template < typename ForwardIterator,
         typename T >
void uninitialized_fill(ForwardIterator first,
                        ForwardIterator last,
                        const T& x,
                        thrust::detail::true_type) { // has_trivial_copy_constructor
    thrust::fill(first, last, x);
} // end uninitialized_fill()

namespace detail {

template<typename T>
struct copy_constructor {
    T exemplar;

    copy_constructor(T x): exemplar(x) {}

    __host__ __device__
    void operator()(T& x) {
        ::new(static_cast<void*>(&x)) T(exemplar);
    } // end operator()()
}; // end copy_constructor

} // end detail

// non-trivial copy constructor path
template < typename ForwardIterator,
         typename T >
void uninitialized_fill(ForwardIterator first,
                        ForwardIterator last,
                        const T& x,
                        thrust::detail::false_type) { // has_trivial_copy_constructor
    typedef typename iterator_traits<ForwardIterator>::value_type ValueType;

    thrust::for_each(first, last, detail::copy_constructor<ValueType>(x));
} // end uninitialized_fill()

} // end dispatch

} // end detail

} // end thrust

